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/* AudioStreamOutALSA.cpp
**
** Copyright 2008-2009 Wind River Systems
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <errno.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#define LOG_TAG "AudioHardwareALSA"
#include <utils/Log.h>
#include <utils/String8.h>
#include <cutils/properties.h>
#include <media/AudioRecord.h>
#include <hardware_legacy/power.h>
#include "AudioHardwareALSA.h"
#ifndef ALSA_DEFAULT_SAMPLE_RATE
#define ALSA_DEFAULT_SAMPLE_RATE 44100 // in Hz
#endif
namespace android
{
// ----------------------------------------------------------------------------
static const int DEFAULT_SAMPLE_RATE = ALSA_DEFAULT_SAMPLE_RATE;
// ----------------------------------------------------------------------------
AudioStreamOutALSA::AudioStreamOutALSA(AudioHardwareALSA *parent, alsa_handle_t *handle) :
ALSAStreamOps(parent, handle),
mFrameCount(0)
{
}
AudioStreamOutALSA::~AudioStreamOutALSA()
{
close();
}
uint32_t AudioStreamOutALSA::channels() const
{
int c = ALSAStreamOps::channels();
return c;
}
status_t AudioStreamOutALSA::setVolume(float left, float right)
{
return mixer()->setVolume (mHandle->curDev, left, right);
}
ssize_t AudioStreamOutALSA::write(const void *buffer, size_t bytes)
{
AutoMutex lock(mLock);
if (!mPowerLock) {
acquire_wake_lock (PARTIAL_WAKE_LOCK, "AudioOutLock");
mPowerLock = true;
}
acoustic_device_t *aDev = acoustics();
// For output, we will pass the data on to the acoustics module, but the actual
// data is expected to be sent to the audio device directly as well.
if (aDev && aDev->write)
aDev->write(aDev, buffer, bytes);
snd_pcm_sframes_t n;
size_t sent = 0;
status_t err;
do {
n = snd_pcm_writei(mHandle->handle,
(char *)buffer + sent,
snd_pcm_bytes_to_frames(mHandle->handle, bytes - sent));
if (n == -EBADFD) {
// Somehow the stream is in a bad state. The driver probably
// has a bug and snd_pcm_recover() doesn't seem to handle this.
mHandle->module->open(mHandle, mHandle->curDev, mHandle->curMode);
if (aDev && aDev->recover) aDev->recover(aDev, n);
}
else if (n < 0) {
if (mHandle->handle) {
// snd_pcm_recover() will return 0 if successful in recovering from
// an error, or -errno if the error was unrecoverable.
n = snd_pcm_recover(mHandle->handle, n, 1);
if (aDev && aDev->recover) aDev->recover(aDev, n);
if (n) return static_cast<ssize_t>(n);
}
}
else {
mFrameCount += n;
sent += static_cast<ssize_t>(snd_pcm_frames_to_bytes(mHandle->handle, n));
}
} while (mHandle->handle && sent < bytes);
return sent;
}
status_t AudioStreamOutALSA::dump(int fd, const Vector<String16>& args)
{
return NO_ERROR;
}
status_t AudioStreamOutALSA::open(int mode)
{
AutoMutex lock(mLock);
return ALSAStreamOps::open(mode);
}
status_t AudioStreamOutALSA::close()
{
AutoMutex lock(mLock);
snd_pcm_drain (mHandle->handle);
ALSAStreamOps::close();
if (mPowerLock) {
release_wake_lock ("AudioOutLock");
mPowerLock = false;
}
return NO_ERROR;
}
status_t AudioStreamOutALSA::standby()
{
AutoMutex lock(mLock);
snd_pcm_drain (mHandle->handle);
if (mPowerLock) {
release_wake_lock ("AudioOutLock");
mPowerLock = false;
}
mFrameCount = 0;
return NO_ERROR;
}
#define USEC_TO_MSEC(x) ((x + 999) / 1000)
uint32_t AudioStreamOutALSA::latency() const
{
// Android wants latency in milliseconds.
return USEC_TO_MSEC (mHandle->latency);
}
// return the number of audio frames written by the audio dsp to DAC since
// the output has exited standby
status_t AudioStreamOutALSA::getRenderPosition(uint32_t *dspFrames)
{
*dspFrames = mFrameCount;
return NO_ERROR;
}
} // namespace android
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